Magnetoresistance effect in the fluctuating-valence BaSmFe[sub 2]O[sub 5+w] system

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Journal Title
Journal ISSN
Volume Title
School of Chemical Technology | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2000
Major/Subject
Mcode
Degree programme
Language
en
Pages
1683-1685
Series
Applied Physics Letters, Volume 77, Issue 11
Abstract
The occurrence of negative magnetoresistance(MR) in semiconductive BaSmFe2O5+w double-perovskite samples is demonstrated. A peak in the MR value was observed at the Verwey–type transition temperature. The transition signifies the charge separation of the Fe2.5+fluctuating mixed valence state into high-spin Fe2+ and Fe3+. The samples were ferrimagnetic with a Curie temperature of ∼710 K. Upon oxidizing/reducing the samples the size of the MR peak and the temperature at which the peak occurred varied. The largest MR value observed was 1.4% at 7 T.
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Keywords
ferrimagnetism, magnetoresistance, Curie point
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Citation
Nakamura, J. & Lindén, J. & Karppinen, Maarit & Yamauchi, H. 2000. Magnetoresistance effect in the fluctuating-valence BaSmFe[sub 2]O[sub 5+w] system. Applied Physics Letters. Volume 77, Issue 11. 1683-1685. ISSN 0003-6951 (printed). DOI: 10.1063/1.1310170.